feat: RFCP MVP deployed on VPS

Iteration 1:
- Dark theme with 3-way toggle
- Dynamic heatmap gradient (blue→red)
- Radius up to 100km
- Save & Calculate workflow

Iteration 2:
- Terrain overlay toggle
- Batch height operations
- Zoom-dependent heatmap rendering

Infrastructure:
- Backend FastAPI on 8888
- Frontend static build via Caddy
- Systemd services
- Caddy reverse proxy integration

backend/venv/lib/python3.12/site-packages/pydantic/v1/version.py

@@ -0,0 +1,38 @@
+__all__ = 'compiled', 'VERSION', 'version_info'
+
+VERSION = '1.10.21'
+
+try:
+    import cython  # type: ignore
+except ImportError:
+    compiled: bool = False
+else:  # pragma: no cover
+    try:
+        compiled = cython.compiled
+    except AttributeError:
+        compiled = False
+
+
+def version_info() -> str:
+    import platform
+    import sys
+    from importlib import import_module
+    from pathlib import Path
+
+    optional_deps = []
+    for p in ('devtools', 'dotenv', 'email-validator', 'typing-extensions'):
+        try:
+            import_module(p.replace('-', '_'))
+        except ImportError:
+            continue
+        optional_deps.append(p)
+
+    info = {
+        'pydantic version': VERSION,
+        'pydantic compiled': compiled,
+        'install path': Path(__file__).resolve().parent,
+        'python version': sys.version,
+        'platform': platform.platform(),
+        'optional deps. installed': optional_deps,
+    }
+    return '\n'.join('{:>30} {}'.format(k + ':', str(v).replace('\n', ' ')) for k, v in info.items())